Sift flour, baking powder, baking soda and salt in a bowl. Set aside.

Melt butter in a pot and set aside to cool.

Mash banana with fork. Set aside.

Beat eggs and sugar until thick and pake yellow. Add melted butter and mix well.

Add mashed banana. Mix well.

Finally, fold in sifted flour mixture.

Pour in about 3/4 tje cupcake molder. steam at high heat for about 20-25 minutes or until the inserted toothpick comes out clean.